Water manipulation is the quickest and easiest way.
One thing to think about....your scale and the meet scale may not be identical.
Check your weight on the meet scale as early as possible. Tell them that you are only checking your weight and that it is not an official weigh-in.
If you're over a little you'll have time to sweat it off in a sauna.
Another alternative is to lose an extra pound or two (on your scale) before the meet.

Be sure you are completely rehydrated before you lift. Lifting while dehydrated promotes injury, and also cuts into your strength.